Bolt anchor



Patented May 9, 1933 UNITED STATES PATENT OFFICE nor a. ncmrosn, or newroax, 1r. Y., assrenoa 'ro J. Enwaan comm comm,-

me, or new omen, new men, a conroaa'rron or mzw'masar m: ancnozaApplication aim October 1, 1980. Serial No. 488,919.

' invention relates to bolt anchors adapted for forming anchorages inmaterial such as brick, stone or cementltious material not ada ted todirectly receive and retain a thread element.

The invention has for its salient object to provide an anchor that issimple and practical in construction, comprises a minimum number ofparts, and will form an eflicient anchorage. v

Another object of the invention is to provide an anchor that can beeasily and quickly expanded to anchoring position and 1s particularlefiective in oversized holes.

Anot er object of the invention is to provide a simple and inexpensivemethod of making an anchor constructed in accordance with the invention.

Further objects of the invention will appear from the followingspecification taken in connection with the drawing, which forms a art ofthis application, and in whlch ig. 1 is a sectional elevation showing ananchor constructed in accordance with the invention disposed in a wallopening prior to expansion;

anchor in expan ed position;

Fig. 3 is an elevational view showing a plurality of washers and a webretaining the washers in spaced relation to each other;

Fig. 4 is an end elevation ofthe construction shown in Fig. 3;

Fig. 5 is a sectional elevation of the anchor; Fig. 6 is an endelevation of the expanded anchor r Fig. is an elevational view showingonehalf of a two part mold and one method of forming the anchor; V

Fig. 8 is an end elevation of the mold shown in Fig. 7;

Fig. 9 is a view similar to Fi 7 butshowing one-half of a two part moland another method of forming the mold;

Fig. 10 is a top plan view of the construction shown in Fig. 9; and

Fig. 11 is an elevational view showing the anchor as it is taken out ofthe mold shown in Figs. 9 and 10,

The invention briefly described consists of a bolt anchor comprising aplurality of washers formed of relativel hard metal, preferablyfrangible, and a ody portion of rela-' tively soft or ductile metalwhich forms a bond for holding the washers in spaced relation and isadapted to be expanded by pressure exerted longitudinally of the ax s ofthe anchor. tapered in cross section, being thicker at the The washersare preferably.

inner periphery than at the outer periphery a we thereof. When thewashers are cast, connects them and holds them in spaced relation toeach other.

- The'washers and connecting web are placed in a mold and a core isplaced in the central opening of the washers. At their inner peripheriesthe washers are recessed or notched,

the recesses being disposed in ahnement to.

permit the relatively soft metal to flow longitudinally of the axis ofthe washers. Two difierentmethods of forming the anchor are shown. Inone method the washers are supported with their axis horizontal and theconnecting web extends into the pouring spout. As the soft metal ispoured into the mold, the spaces between the washers are filled and thewashers are bonded together by one or more longitudinally extending websof soft metal, these webs being-formed in the recesses. After the metalhas been poured and the mold sections have been separated, the softmetal sprue is broken oil? and the web which connected the washers willbe broken off with the sprue.

In another form of the invention the washers are supported with theiraxis vertical, as shown in Figs. 9, 10 and 11.

Further detalls of the invention will appear from the followingdescription.

In the particular form of the inventionfrom the inner periphe' and inthe form of the invention shown in i 4 two sets of r cesses areillustrated atdlametrically opposite points.

Fi 7 and 8 illustrate one method of forming t e anchorage. In thesefigures there is shown a mold comprising two sections and 26. Thewashers -and connecting web 20 are placed in the mold as shown in Fig.8, with the connectin web into the pourmg spout 28. A core extendsthrough the mold and through the openings in the washers, as shown inig. 7.

The softmetal is melted and poured into the pouring spout 28 and fillsthe spaces between the washers and flows longitudinally in the mold,forming a pair of bonding or connecting portions 31 and 32.

When the anchor is removed from the mold, the soft metal sprue 33. whichis formed in i the gate opening andweb 20 are broken off,

leaving. the anchorin the form shown in fn the method illustrated inFigs. 9, 10 and 11, the washers-and web are supported vertically betweena pair 'ofmold sections 35 and 36 and a central core 37 extends throughthe washers. Th'e melted soft metal is vpoured through openingls 40 and41 and fills the spaces between t e washers and also the re-' cesses 21.The anchor as itis removed from the mold is shown in Fig. 11. The sprue42 is then broken off and the web 20 is also broken off leaving theanchor in the form shown in ig. 5.

The anchor is expanded in the manner shown in Figs. 1 and 2.; A headedbolt is passed through the anchor and the anchor and bolt are insertedin the wall opening or hole in the manner shown in Fi 1. A pipe ortubular member 52 is place around the shank of the bolt and is tampedwith a hammer or other suitable tool, thus forcing the soft or ductilemetal body portion of the anchor to be expanded laterally into grippingengagement with the wall opening. The hard metal of the washers 1spreferably frangible and breaks into fragments under the pressureexerted by the expanding tool. As the hard metal washers are broken, thesoft metal fills the spaces between the fragments and since the washersare tapered the soft metal will be forced laterally and outwardly. As amatter of fact, the broken fragments of the'hard metal washers functionin a manner similar to the aggregate in concrete and reinforce theanchor.

Anchors such as that described may be used singly or, if desired, aplurality of such anchors may be used and in this case they are expandedsuccessively.

Although certain specificembodiments of the invention have beenparticularly shown and described, it will be understood that theinvention is capable of modification and that 20 extending upwardlychanges in the'construction and in the tr-f rangement of the variouscooperating parts may be made without departing from the 1 spirit orscope of the invention, as expressed l 7 v a o in the following claims.

What I claim is:

1. A bolt anchor comprising a bodyportion of relatively soft metalhaving a central opening therethrough, and a plurality of spaced washersof relatively hard metal surrounding said opening and embedded in said 4soft metal body portion, said washers having openings coaxial with theopening in the soft metal and being held in spaced relation by said softmetal. p 7 p 2. A bolt anchor comprisin a 'body portion of relativelysoft metal, an a plurality of spaced washers of relatively hard metalembedded in said soft metal body portion, said washers beingwedge-shaped in section and held in spaced relation by said soft metal.

3. A bolt anchor comprising a body portion of relatively soft metalhaving a central opening therethrough, and a plurality of spaced washersof relatively hard frangible metal surrounding said openingand embeddedin said soft metal body portion, said washers having openings coaxialwith the opening in the soft metal and being held in spaced relation bysaid soft metal.

4. A bolt anchor comprising a plurali axes coincident and dis osed inspaced relation to each other, an a body ortion of relatively soft metalembedding said washers and bonding the washers in spaced relation toeach other.

5. A bolt anchor comprising a plurality of alternately arranged,successive transverse sections of elements of relatively hard metal andof relatively soft metal, said sections being bonded together into anintegral unit.

6. A bolt anchor comprising a pluarlity of" layers being bonded togetherinto an integral unit, said anchor having a central bore or openingtherethrough formed by said apertures. v

8. A bolt anchor comprising a plurality of apertured washers ofrelatively ard metal of relatively hard metal washers having t eir.

arranged in spaced relation with their axes coinciding an the openingstherein in substantial alinement, and a body portion ofductile metalfilling thespaces between the washers and forming a bond to hold .thewashers.

9. A molded bolt anchor unit comprising a structure having spacedoppositely facing outwardly tapered portions of relatively hard metal,and a sleeve of relatively soft material disposed between said taperedportions and filling the space therebetween prior to expansion of theanchor.

10. A molded bolt anchor unit comprising a structure having 0 positelyfacing portions inclined relative to t e axis of the anchor and awayfrom each other and formed of relatively hard metal, the parts of saidportions remote from the axis being farther apart than the parts nearerthe axis, and a sleeve of relatively soft material disposed between saidportions and filling the space therebetween prior to expansion of theanchor.

11. A molded bolt anchor unit comprising a structure having oppositelyfacing portions inclined relative to the axis of the anchor and awayfrom each other and formed of relatively hard metal, and a sleeve ofrelatively soft material disposed between said portions and filling thespace therebetween prior to expansion of the anchor.

12. A molded unit for a bolt anchor comprising a structure having aplurality of oppositely facing portions held in spaced relation by anintegral member, said portions and member being formed of .relativelyhard material, and a sleeve of relatively soft material disposed betweenand filling the space between the oppositely facing portions.

13. A molded bolt anchor unit comprising a structure having spacedoppositely facin tapered portions of relatively hard metal, an a sleeveof relatively soft material disposed between said tapered portions andfilling the space therebetween prior to expansion of the anchor.

14. A bolt anchor unit comprising a body portion of relatively softmetal and a plurality of spaced washers of relatively hard frangiblemetal, said washers surrounding the bolt and being held in spacedrelation by said soft metal and the spaces between the washers beingfilled thereby.

ROY E. McINTOSH.

